Is the highest call OI strike resistance and the highest put OI strike support?
The largest call OI strike is not by itself a ceiling and the largest put OI strike is not by itself a floor, because open interest counts open contracts and not the reasons for holding them. The leading strikes move from one date to the next, so one chain cannot test whether a strike held.
Intermediate
Data as of 29 Jun 2026
Reviewed 16 Oct 2026
Trap check
rupeecase.com/q/highest-oi-support-resistance
The largest call OI sits far above the index and the largest put OI sits just below it
Call and put open interest by strike at the 10 Jun 2026 close for the 30 Jun 2026 expiry, in units. Strikes are spaced wide apart for readability. Source: NSE end of day data, computed by RupeeCase. As of 10 Jun 2026.
Read the 30 Jun 2026 chain from 10 Jun 2026. The largest call open interest sits far above the index, and the largest put open interest sits just below it. Put together, the chain looks like a range, with calls as a ceiling and puts as a floor. That is the reading the claim makes.
The claim treats an open interest strike as a wall. Open interest counts contracts still open at the close. It does not say who holds them, whether they are hedges, spreads or outright positions, or whether the holder would defend the strike. A large call open interest at a far strike can be one leg of a hedge, not a level the index has to respect.
The leading strikes also move. Follow the same expiry across three dated chains. On 10 Jun 2026 the largest put open interest sat at one strike, on 16 Jun at a higher one, and on 29 Jun at a third. The largest call open interest stayed at the same far strike on all three dates. On the 16 Jun weekly expiry, the largest call and put open interest sat right beside the close. One expiry shows nothing either way.
A wall that moves from one date to the next cannot be tested as support or resistance by one chart. A test needs many expiries and a record of how often the leading strike held or was breached. The school files do not hold that record, so the claim is not tested here.
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Is the highest call OI strike resistance and the highest put OI strike support?
The largest call OI strike is not by itself a ceiling and the largest put OI strike is not by itself a floor, because open interest counts open contracts and not the reasons for holding them. The leading strikes move from one date to the next, so one chain cannot test whether a strike held. Not supported as a rule. Open interest counts open contracts, not the reasons for holding them, and a test would need many expiries and a record of how often a leader held.
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Education only, not investment advice, a research report or a recommendation to buy, sell or hold any security. RupeeCase (QC Alpha Technologies Pvt Ltd) is not registered with SEBI as an investment adviser or research analyst. Contracts and prices shown are for illustration only, come from NSE end of day files at least 30 days old, and are not recommendatory. Derivatives trading carries a high risk of loss.
